QUARTZ PORPHYRY TREATMENT ALTERS IRRIGATION WATER CHEMISTRY,AFFECTING HYDROPONIC VEGETABLE PRODUCTION     

M. Abul Kalam Azad  Naima Islam  Katsumi Ishikawa 《Journal of plant nutrition》2013,36(11):1712-1731

This study focused on using quartz porphyry (QP) as a water treatment to improve hydroponic production of komatsuna (Brassica rapa L. nothovar; Japanese mustard spinach). We compared the chemistries of the control and QP-treated nutrient solutions and found that magnesium (Mg²⁺) and calcium (Ca²⁺) concentrations increased linearly up to day 21 following sowing in both conditions, then declined slightly. The QP treatment reduced sodium (Na⁺) and chloride (Cl^?) concentrations for the whole cultivation period. In both the control and QP-treated solutions, nitrate (NO^? ₃) and sulfate (SO^2? ₄) showed the same trend to a daily increase. In spite of these similarities, however, komatsuna production was better with the QP-treated nutrient solution compared to control. Treatment with QP during cultivation in August–September reduced the harmful effects of Na⁺, chloride (Cl^?), nitrite (NO^? ₂), and SO^2? ₄ by reducing concentrations of these ions, possibly leading to decreased salinity and toxicity effects in the plants. Mineral concentrations during October–November differed from those of August/September, resulting in variation among the different growth parameters for komatsuna.  相似文献   

Microbial reduction mechanism of ferric iron in paddy soils (Part I)     

Takao Kamura  Yasuo Takai  Kanji Ishikawa 《Soil Science and Plant Nutrition》2013,59(5):5-9

In the previous paper¹⁾ the authors proved that the ferric iron reduction in submerged paddy soils is entirely or mostly effected by the activities of microorganisms in the soil. Prior to the study on the ferric iron reducing microorganisms isolated from the soil, the present paper reports the research for the microbial mechanism of iron reduction. working with the soil itself.  相似文献   

Comparative toxicity of Al3+, Yb3+, and La3+ to root-tip cells differing in tolerance to high Al3+ in terms of ionic potentials of dehydrated trivalent cations     

Satoru Ishikawa  Tadao Wagatsuma  Taro Ikarashi 《Soil Science and Plant Nutrition》2013,59(3):613-625

Abstract

Green manure legumes are often used to compare biomass production as well as nitrogen-fixing capacity. Mineral deficiency often limits the symbiotic nitrogen fixation of many legumes, thus limiting their productivity despite their high yielding potential (O’Hara et al. 1988; Flis et al. 1993). Leguminous species require large amounts of P for growth, nodulation, and nitrogen fixation. Consequently, they are often unable to grow in acid soils with low available P. The low P availability in tropical acid soils often arises from fixation of P by Al and Fe in soil. Generally, Al and Fe-phosphates are relatively unavailable to plants (McLachlan 1976; Ae et al. 1990).  相似文献   

Stimulatory effect of aluminum on the growth of tea pollen tubes     

Hiromi Yokota  Ikuyo Takamura  Fumiko Ishikawa  Miwako Ohta  Shigeki Konishi 《Soil Science and Plant Nutrition》2013,59(2):457-461

It is well known that when inorganic elements such as boron (B), calcium, cobalt, and manganese are added to media in combination or alone, they stimulate the germination and/or tube growth of various kinds of pollen (Schmücker 1933; Loo and Hwang 1944; Yamada 1958; Brewbaker and Kwack 1963). Among these elements, the stimulatory effect ofB is the most effective and generally recognized. Aluminum (Al) belongs along with B to Group IIIa in the periodic table, and Fähnrich and Ultlich (1964) reported that Al inhibited the germination and growth of the pollen tube of Petunia hybrida and Antirrhinum majus. However, stimulatory effects of Al on pollen germination or pollen tube growth had not been previously reported.  相似文献   

The plasma membrane intactness of root-tip cells is a primary factor for Al-tolerance in cultivars of five species     

Satoru Ishikawa  Tadao Wagatsuma  Tsuyoshi Takano  Keitaro Tawaraya  Koji Oomata 《Soil Science and Plant Nutrition》2013,59(3):489-501

We investigated the role of the cell wall and plasma membrane (PM) of root-tip cells in Al tolerance in Al-tolerant and Al-sensitive cultivars of five plant species (rice, maize, pea, wheat, and sorghum). No correlation was found between the differences in Al tolerance and the cation exchange capacity of cell walls isolated from root-tips (0–1 em). Preliminary exposure to Al for 1 h was sufficient to inhibit subsequent root re-elongation in an Al-free solution, and the inhibitory effect was more pronounced in the Al-sensitive cultivars than in the Al-tolerant ones. Together with the inhibition of root re-elongation, the PM of the root-tip cells of all the Al-sensitive cultivars was more permeabilized than that of the Al-tolerant cultivars, based on the FDA-PI fluorescence staining technique. Exposure for 30 min to Al treatment at 100 µM significantly increased the PM permeability of protoplasts isolated from the root-tips for the Al-sensitive pea cultivar placed in a moderately hypotonic medium. Protoplasts from root-tip portions of all the Al-sensitive cultivars took up more Al than those of the Al-tolerant ones when treated with 100 pM Al under isotonic conditions for 30 min. The co-existence of DNP or hypotonic conditions led to a larger increase of Al uptake by the protoplasts from Al-sensitive maize cultivars. These results suggest that Al ions rapidly alter the PM of the root-tip portion in the Al-sensitive cultivars, irrespective of plant species, resulting in an increase of the PM permeability.  相似文献   

Development of GIS-based FUSLE model in a Chinese fir forest sub-catchment with a focus on the litter in the Dabie Mountains,China     

Zhang Jin-Chi  Zhuang Jia-Yao  Su Ji-Shen  Nakamura Hiroyuki  Ishikawa Haruyoshi  Cheng Peng  Fu Jun 《Forest Ecology and Management》2008

Land use plays an important role in soil loss and other environmental problems. Correct prediction of soil loss from different types of land use is very important to land use policy making in the Dabie Mountains, China. Field observations of water and soil loss were carried out in the Shangshe catchment in four types of land use in 1999–2002. This paper reports the study of soil loss in the sub-catchment of Chinese fir forest.  相似文献   

BRONCHOCUTANEOUS FISTULA IN A DOG     

Norio  Yamagishi  DVM  PhD  Kazutaka  Yamada  DVM  PhD  Hiroshi  Ishikawa  DVM  PhD  Haruo  Yamada  DVM  PhD 《Veterinary radiology & ultrasound》2000,41(5):422-424

A dog with a bronchocutaneous fistula is described. Contrast enhanced computed tomography was useful for diagnosis and treatment of the fistula in this dog.  相似文献   

Effect of density of trees on drag exerted on trees in river channels     

Yoshiharu Ishikawa  Kunio Mizuhara  Shinnya Ashida 《Journal of Forest Research》2000,5(4):271-279

Recently, riparian forests have attracted attention as they are effective for ecological preservation and landscape enhancement. Uses of such forests in flood prevention, sediment control, and erosion control works have been actively promoted. This study aims to clarify the effect of density of riparian trees on drag exerted on trees along river channels under the regime of bed load transport. Hydraulic model experiments were performed using a straight channel, and the methods to calculate the drag coefficient necessary for deriving drag exerted on trees were studied. Previous studies have stated that the drag coefficient of a cylinder is fairly constant when Reynolds number,R _e, is between 10³ and 10⁵ (e.g., Schlichting, 1979). This study clarified, however, that in cases of relatively dense arrangements of model trees (cylinders), the drag coefficient varies greatly with the density of the trees. As such, correlation between the drag coefficient and Reynolds number was found to be slight. Test results indicated that the drag coefficient of trees,C _d, correlates strongly with the coefficient of velocity,U′/U _* ′, friction factor of the channel bed,f′, and roughness concentration of trees × flow depth,aH′ or ratio of the area occupied by trees,λ. Furthermore, the drag coefficient,C _d, was also found to be slightly correlated with the gradient of the channel bed,I. Equations using either of the following parameters were obtained for deriving the drag coefficient,C _d, based on the experiment results:aH′; λ; U′/U _* ′; and Froude numberF _r. These equations allow fairly accurate calculation of drag exerted on trees.  相似文献   

Nutritional assessment and feed intake of microparticulate diets in crustaceans and fish   总被引：1，自引：0，他引：1  

S Teshima  M Ishikawa  & S Koshio 《Aquaculture Research》2000,31(8-9):691-702

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Diagnosis of severe fever with thrombocytopenia syndrome (SFTS) in a cat with clinical findings resembling lymphoma     

Mitsuhiro IRIE  Takuma MIYOSHI  Akira HIRAMOTO  Masahiko HIRATA  Masamine TAKANOSU  Eun-Sil PARK  Ken MAEDA 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2022,84(5):675

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